Question: Who is the {protein} for {physically interacts with} of {fentanyl}
Paraphrase: Who is the {protein} for {physically interatomic with} of {fentanyl}
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P129 wd:Q407541 . ?sbj wdt:P31 wd:Q8054 } 
Answer: Opioid receptor mu 1, Opioid receptor kappa 1, Opioid receptor delta 1